Sentence Type and Purpose

Question 1

The simple sentence

Answer 1

A simple sentence is simple because it contains only one independent clause:

Justin dropped his Agricultural Economics class.

A simple sentence is not necessarily short or simple. It can be long and involved, with many parts and compound elements. But if there is only one independent clause, it is, nevertheless, a simple sentence. The following example has a single independent clause with a single subject (Justin) and a compound verb (gulped, swallowed, groaned, and decided):

Justin gulped down his fourth cup of coffee, swallowed a Tylenol for his pounding headache, groaned, and decided he would have to drop his Agricultural Economics class.

Question 2

The compound sentence

Answer 2

When you join two simple sentences properly, you get a compound sentence. Conversely, a compound sentence can be broken into two complete sentences, each with its own subject and its own verb. You can join simple sentences to create compound sentences either of two ways:

With a semicolon
With a comma and coordinating conjunction (for, and, nor, but, or, yet, so)
For example, the following pairs of independent clauses can be joined either way:

Homer has Basic Plant Science on Mondays and Wednesdays; Environmental Horticulture conflicted with his schedule.

Homer has Basic Plant Science on Mondays and Wednesdays, but Environmental Horticulture conflicted with his schedule.

If you choose to coordinate two independent clauses using a semicolon, you have another option. You may choose to add a conjunctive adverb (followed by a comma-the adverb acts rather like an introductory phrase) after the semicolon:

Jennifer put a new washer in the bathroom faucet before leaving for the party; moreover, Mai figured out how to fix the garbage disposal.

(Be aware that if you join two simple sentences improperly, you do not get a compound sentence; you get a run-on, most likely either a comma splice or a fused sentence. For more information, see the TIP Sheets Comma Splices and Run-on Sentences and Independent & Dependent Clauses: Coordination & Subordination.)

Question 3

The complex sentence

Answer 3

A complex sentence is a sentence that contains both a dependent and an independent clause. In the following example, both clauses contain a subject and a verb, but the dependent clause has, in addition, the dependent-making words even though. If you start the sentence with the dependent-making words (or subordinating conjunction), place a comma between the clauses. On the other hand, if you start with the independent clause and place the dependent-making words in the middle of the sentence, do not use a comma:

Even though Eva took Turf Management just to fill out her schedule, she found it unexpectedly interesting.

Eva found Turf Management unexpectedly interesting even though she took it just to fill out her schedule.

(For more on subordinating conjunctions, see the TIP Sheet Independent & Dependent Clauses: Coordination & Subordination.)

Question 4

The compound-complex sentence

Answer 4

A compound-complex sentence combines at least two independent clauses and at least one dependent clause. The punctuation rules remain the same: the two simple sentences are joined by one of the two methods described above, and the dependent clause is punctuated (or not) depending on whether it precedes or follows an independent clause. In the following example, the dependent-making word signaling the beginning of the dependent clause is while:

Homer was already in class, and Eva was in the lab while Justin was sleeping off his headache.

While Justin was sleeping off his headache, Homer was already in class, and Eva was in the lab.

Homer was already in class while Justin slept off his headache; Eva was in the lab.

Question 5

Sentence Purpose

Answer 5

Sentences can do different things. The purpose of some sentences is to make statements. Declarative sentences make statements and end with periods:

I am planning to drop Agricultural Economics.

The purpose of another sentence may be to pose a question. These interrogative sentences ask questions and end with question marks:

Have you taken any Agricultural Engineering classes?

Imperative sentences give commands or make demands or requests. They usually end with a period. An imperative sentence often has as its subject an unstated “you” (giving to beginners in English grammar the appearance of lacking a subject altogether). The subject of each of the following four sentences is “you:”

Hand in your homework assignments, please.

Stop. Drop. Roll.

Exclamatory sentences convey strong emotion and end with exclamation marks; use them sparingly:

Watch out for the rattlesnake!